• Journal of the korean Society of Automotive Engineers
• /
• v.15 no.6
• /
• pp.23-32
• /
• 1993

스파크 점화기관의 연소과정 해석은 엔진성능분석 및 예측의 핵심이며 배기가스 배출과도 밀접히 연관된다. 스파크 점화기관의 연소해석을 수행하기 위해 연소실 압력 측정, 유사 차원 해석, 3차원 유동 및 연소 해석을 수행하여 결과를 비교하였다. 이들 방법은 서로 일치하는 경향을 보이며 상호간의 장단점을 보완하는 역할을 할 수 있음을 알 수 있다. 본 연구는 이러한 시도의 첫번째 결과로서 계속적인 비교 연구가 수행될 예정이다.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.1 no.1
• /
• pp.22-31
• /
• 1993

Spark-ignition engine knock is affected by engine operating conditions such as engine speed, spark timing and intake air temperature. In this study the effect of intake air temperature on knock characteristics was studied experimentally using a 4-cylinder carburetor spark-ignition engine. The cylinder pressure data at 2000rpm were taken for intake air temperature range of $30^{\circ}C$ to $80^{\circ}C$ with $10^{\circ}C$ interval. And 80 consecutive cycles were taken at each experimental condition. As the same spark timing, as the intake air temperature increased by $50^{\circ}C$, the mean knock intensity increased about 20kPa. This effect corresponds to that of spark timing advance of 3 crank angle degrees.

• Journal of Energy Engineering
• /
• v.23 no.1
• /
• pp.75-80
• /
• 2014

The past several years have seen a substantial growth in mathematical modeling activities whose interests are to describe the performance, efficiency and emissions characteristics of various types of internal combustion engines. The key element in these simulations of various aspects of engine operation is the model of the engine combustion process. Combustion models are then classified into three categories: zero-dimensional, quasi-dimensional and multidimensional models. zero-dimensional models are built around the first law of thermodynamics, and time is the only independent variable. This paper presents a introduction to the combustion characteristics of a spark ignition combustion modeling by zero-dimensional model.

• Journal of the korean Society of Automotive Engineers
• /
• v.13 no.5
• /
• pp.26-34
• /
• 1991

내연기관 가솔린엔진에서 점화전은 매우 중요하다. 그것은 2만볼트의 스파크를 흘려 혼합기를 연소시키기 때문이다. 본 고는 통상의 스파크화염보다 수십배 더 큰 화염의 생성을 이루는 몇가지 방법과 그것이 엔진에 미치는 영향들을 분석 제시하여 어느 한 요소가 향상한다고 할 때 혹 타 부문에 여타 영향을 주는지의 여부도 함께 고찰하여 실제로 사용할 수 있는 기술로서의 검토를 함이다.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.6 no.5
• /
• pp.191-198
• /
• 1998

In this study, the effects of water vapor in inlet air, spark advance and fuel type in the spark ignition engine were investigated through the experiments of combustion and flame arriving pattern analysis using ionization probe. The results of flame propagation experiment using ionization probe show that the flame which ignited from spark plug located at the center of the combustion chamber propagated faster in exhaust side than in intake side due to the mixture flow motion inducted into combustion chamber from intake tumble port at all conditions. And as the partial vapor pressure increased, the flame propagation became slower in all direction. Especially effects were greater for intake side than the exhaust side.

• Journal of Advanced Marine Engineering and Technology
• /
• v.27 no.2
• /
• pp.246-259
• /
• 2003

For predicting the performances of the four stroke cycle spark ignition engines. the gas behavior in the engine system has been analyzed. The calculations consist of two parts. the calculation of the gas behavior in the intake and exhaust systems which was described in the first paper, and the calculation of the variations of gas properties inside the engine cylinders. In this Paper the simulations for the in-cylinder processes were described for the MPI engine, naturally aspirated and turbocharged engines with a carburettor. With the combination of the calculations of the intake and exhaust systems and the calculation of the in-cylinder processes. the predictions of the engine Performances and the exhaust emission characteristics were carried out. And the result showed good agrements with the experimental results under wide range of operating conditions.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.4 no.4
• /
• pp.58-71
• /
• 1996

A model which calculates the hydrocarbon emissions from spark ignition engines is presented The model contains the formation of HC emissions due to both crevices around piston ring top land and oil films on the cylinder wall. The model also considers in-cylinder oxidation and exhaust port oxidation of desorbed HC from crevices and oil films after combustion process. The HC emissions model utilizes the results of SI engine cycle simulation. The model predicts well the trends of HC emissions from the engines when varying engine parameters.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2003.06a
• /
• pp.1249-1252
• /
• 2003

To analyse the cyclic variations in a test engine, the burn parameters are determined on a cycle-to-cycle basis through the analysis of the engine pressure data. Combustion analysis based on cylinder-pressure provides a mechanism through which a combustion researcher can understand the combustion process. The objective of this paper is to identify the most significant sources of cycle-to-cycle combustion variability in a spark ignition engine at idle. The burn rate analysis program was used and the burn parameters were used to determine the variations in the input parameter. In this study, the author investigated the relationship of indicated mean effective pressure, coefficient of variation of indicated mean effective pressure and burn angles, and lowest normalized value in a spark ignition engine for the cyclic variations.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.12
• /
• pp.2682-2688
• /
• 2012

In this paper, we design and implement a electric current controller for ignition coil to measure the amount of current and to supply the additional current under vehicle driving conditions in spark ignition engines. The proposed controller can provide the stable current and prevent the overcurrent by measuring the amperage of primary ignition in real time. Also it enhances the performance of vehicle engine by controling the amount of ignition energy that make power increase and fuel burn more completely. The power and torque of the normal vehicle is evaluated as performance index for the experimental validation of the control module. The experimental results using dynamometer equipment show that after control module-mounted elevates the average of 10% more in both power and torque compared with before module-mounted.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.20 no.11
• /
• pp.3676-3685
• /
• 1996

Enhancement of the ignitability was necessary to realize the lean burn engine. The characteristics of multiple-spark capacitor discharge igniter(MSCDI) usefulness of which for lean burn was examined in constant volume combustion chamber and evaluated in spark ignition engine. Noise of MSCDI for engine was restricted by adoption of low voltage control system. It was found that the adaptability for high engine speed was remarkable. Lean limit in engine with MSCDI was extended 10% than conventional coil ignition system. Also maximum brake thermal efficiency was almost enhanced 1%.